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参数资料
| 型号： | LT3651EUHE-4.2#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | BATTERY CHARGE CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PQCC36 |
| 封装： | 5 X 6 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, QFN-36 |
| 文件页数： | 3/22页 |
| 文件大小： | 213K |
| 代理商： | LT3651EUHE-4.2#PBF |
LT3651-4.1/LT3651-4.2
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OPERATION
setting the maximum charge current. Manipulation of
maximum charge current is possible through the RNG/SS
and ILIM pins (see the RNG/SS: Dynamic Charge Current
Adjust, RNG/SS: Soft-Start and ILIM Control sections).
If the voltage on the BAT pin (VBAT) is below VBAT(PRE),
A7 initiates the precondition mode. During the pre-
condition interval, the charger continues to operate in
constant current mode, but the ITH clamp is reduced to
0.15V reducing charge current to 15% of the maximum
programmed value.
As VBAT approaches the float voltage (VFLOAT) the voltage
error amp V-EA takes control of ITH and the charger transi-
tions into constant voltage (CV) mode. As this occurs, the
ITH voltage falls from the limit clamp and charge current is
reduced from the maximum value. When the ITH voltage
falls below 0.1V, A8 signals C/10. If the charger is config-
ured for C/10 termination the charge cycle is terminated.
Once the charge cycle is terminated, the CHRG status
pin becomes high impedance and the charger enters low
current standby mode.
The LT3651 contains an internal charge cycle timer that
terminates a successful charge cycle after a programmed
amount of time. This timer is typically programmed to
achieve end-of-cycle in three hours, but can be configured
for any amount of time by setting an appropriate timing
capacitor value (CTIMER). When timer termination is used,
the charge cycle does not terminate after C/10 is achieved.
Because the CHRG status pin responds to the C/10 current
level, the IC will indicate a fully charged battery status,
but the charger will continue to source low currents. At
the programmed end of the cycle time the charge cycle
stops and the part enters standby mode. If the battery
did not achieve at least 97.5% of the full float voltage at
the end-of-cycle, charging is deemed unsuccessful and
another full-timer cycle is initiated.
Use of the timer function also enables bad battery detec-
tion. This fault condition is achieved if the battery does
not respond to preconditioning and the charger remains
in (or enters) precondition mode after one-eighth of the
programmed charge cycle time. A bad battery fault halts
the charging cycle, the CHRG status pin goes high imped-
ance and the FAULT pin is pulled low.
When the LT3651 terminates a charging cycle, whether
through C/10 detection or by reaching timer end-of-cycle,
the average current mode analog loop remains active but
the internal float voltage reference is reduced by 2.5%.
Because the voltage on a successfully charged battery is
at the full float voltage, the voltage error amp detects an
overvoltage condition and rails low. When the voltage error
amp output drops below 0.3V, the IC enters standby mode,
where most of the internal circuitry is disabled and the
VIN bias current is reduced to <100μA. When the voltage
on the BAT pin drops below the reduced float reference
level, the output of the voltage error amp will climb, at
which point the IC comes out of standby mode and a new
charging cycle is initiated.
The system current limit allows charge current to be
reduced in order to maintain a constant input current.
Input current is measured via a resistor (RCL) that is
placed between the CLP and CLN pins. Power is applied
through this resistor and is used to supply both VIN of the
chip and other system loads. An offset produced on the
inputs of A12 sets the threshold. When that threshold is
achieved, ITH is reduced, lowering the charge current thus
maintaining the maximum input current.
50μA of current is sourced from ILIM to a resistor (RILIM)
that is placed from that pin to ground. The voltage on ILIM
determines the regulating voltage across RCL. 1V on ILIM
corresponds to 95mV across RCL. The ILIM pin clamps
internally to 1V maximum.
If the junction temperature of the die becomes excessive,
A10 activates decreasing ITH and reduces charge current.
This reduces on-chip power dissipation to safe levels but
continues charging.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3651EUHE-8.2#PBF | 制造商:Linear Technology 功能描述:IC CHRG MGMT LI-ION/LI-POL 36QFN 制造商:Linear Technology 功能描述:DP-Battery Charger, Monolithic 4A High Voltage Li-Ion Battery Charger |
| LT3651EUHE-8.2#TRPBF | 制造商:Linear Technology 功能描述:IC CHRG MGMT LI-ION/LI-POL 36QFN 制造商:Linear Technology 功能描述:DP-Battery Charger, Monolithic 4A High Voltage Li-Ion Battery Charger |
| LT3651EUHE-8.4#PBF | 制造商:Linear Technology 功能描述:IC CHRG MGMT LI-ION/LI-POL 36QFN 制造商:Linear Technology 功能描述:DP-Battery Charger, Monolithic 4A High Voltage Li-Ion Battery Charger |
| LT3651EUHE-8.4#TRPBF | 制造商:Linear Technology 功能描述:IC CHRG MGMT LI-ION/LI-POL 36QFN 制造商:Linear Technology 功能描述:DP-Battery Charger, Monolithic 4A High Voltage Li-Ion Battery Charger |
| LT3651IUHE-4.1#PBF | 制造商:Linear Technology 功能描述:Battery Charger Li-Ion/Li-Pol 4000mA 4.1V 36-Pin QFN EP 制造商:Linear Technology 功能描述:IC CHRG MGMT LI-ION/LI-POL 36QFN 制造商:Linear Technology 功能描述:DP-Battery Charger, Monolithic 4A High Voltage Li-Ion Battery Charger |
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